EP0193961A2 - Verfahren zum Auswählen von Informationen eines Plattenspielers - Google Patents

Verfahren zum Auswählen von Informationen eines Plattenspielers Download PDF

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Publication number
EP0193961A2
EP0193961A2 EP86102999A EP86102999A EP0193961A2 EP 0193961 A2 EP0193961 A2 EP 0193961A2 EP 86102999 A EP86102999 A EP 86102999A EP 86102999 A EP86102999 A EP 86102999A EP 0193961 A2 EP0193961 A2 EP 0193961A2
Authority
EP
European Patent Office
Prior art keywords
information
track
radiated beam
register
address information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86102999A
Other languages
English (en)
French (fr)
Other versions
EP0193961A3 (en
EP0193961B1 (de
Inventor
Kiyoshi Otani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP4680485A external-priority patent/JPS61206932A/ja
Priority claimed from JP5086685A external-priority patent/JPS61210526A/ja
Application filed by Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Publication of EP0193961A2 publication Critical patent/EP0193961A2/de
Publication of EP0193961A3 publication Critical patent/EP0193961A3/en
Application granted granted Critical
Publication of EP0193961B1 publication Critical patent/EP0193961B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/08—Track changing or selecting during transducing operation
    • G11B21/081—Access to indexed tracks or parts of continuous track
    • G11B21/083—Access to indexed tracks or parts of continuous track on discs
    • G11B21/085—Access to indexed tracks or parts of continuous track on discs with track following of accessed part
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
    • G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2545—CDs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/60—Solid state media
    • G11B2220/65—Solid state media wherein solid state memory is used for storing indexing information or metadata
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/11—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier

Definitions

  • the present invention relates to an information selection device of a disc player and particularly to an information selection device which can rapidly search a desired piece number and a desired index on a disc where a plurality of pieces are optically recorded so that the disc player can start to play the music of the desired piece number and index.
  • a disc player which uses an optical pickup to reproduce a digital signal from a disc where concavities and convexities corresponding to the digital signal are engraved, for example, a digital audio disc player is well-known in the art.
  • an index of a disc called a table of contents (TOC) is recorded on a lead-in track located on the innermost circumference of the disc and this TOC includes data on the pieces recorded on the disc indicating a time code value of each piece, that is, the time represented as minutes and seconds when each piece is to be played from the first track of the program area of the disc.
  • Subcodes in each frame of the signal contain data on the piece number and the index which the signal frame belongs to, the time represented as minutes and seconds required from the first track of the program area, etc. If the disc thus structured is set in a play mode, the disc player first reads and stores the above described TOC.
  • Such a conventional digital audio disc player uses a method for rapidly searching a track to be started, that is, a target track of a desired piece out of a plurality of pieces recorded on a disc.
  • a method is disclosed for example in the Japanese Patent Laying-Open Gazette No. 8695/1980 (U.S. Patent 4,506,355).
  • the first means first selects a target address of a target track of a desired piece to be played.
  • the second means monitors the modulated beam so that the address of the track hit by the incident beam is detected from the information recovered by the hitting of the incident beam onto the disc.
  • the third means detects an indication of the distance between the target track and the hitting point of the incident beam and the moving means is adjusted by the control means so that the distance between the hitting point of the incident beam and the target track may be decreased. As the above described distances is decreased, the moving speed of the beam is reduced.
  • the control means stops the moving means to bring the search to an end.
  • the indication of the distance between the target track and the hitting point of the incident beam can be obtained by detection of a difference between the time period converted based on the distance from the lead-in track to the track hit by the incident beam and the time period converted based on the distance from the lead-in track to the target track.
  • the time period required from the first track of the program area of the disc to the track at the start of the designated piece is determined from the content of the TOC stored in the disc player as described above and this time period is regarded as the target time.
  • the time period required from the first track of the program area to the track hit by the radiated beam at present is determined by the subcode in each frame of the signal.
  • the distance between the target track and the hitting point of the incident beam can be determined as the time by detection of a difference between the above described target time and the time required to attain the track hit by the beam.
  • the moving speed of the moving means is determined by steps and as a result, the hitting point of the incident beam never exceeds the target track and the target track can be searched rapidly.
  • the TOC stores the time from the first track of the program area to the track at the start of each piece, that is, the "absolute time (A time)".
  • the TOC does not store the A time from the first track of the program area to each index existing within each piece and consequently, the indexes existing within each piece cannot be searched directly.
  • the present invention is an information selection device of a disc player which optically reads information from a disc having a plurality of tracks where information of a plurality of pieces is optically recorded, and said information selection device comprises: pickup means for radiating a light beam on the tracks of the disc; beam detecting means for detecting information from the beam reflected from the track; moving means for moving the radiated beam to make the beam cross the tracks of the disc; and signal processing means.
  • the information of each of the plurality of pieces contains information of its own piece number and information concerning a plurality of indexes existing within the piece.
  • the light beam radiated and hit on the disc is modulated and reflected so that the beam detecting means detects at predetermined intervals the information of the piece number and the index of the track hit by the beam at present from the reflected beam.
  • the signal processing means comprises read means, write means and comparing means.
  • the read means reads the information detected by the beam detecting means concerning the piece number and the index of the track hit by the radiated beam at present.
  • the write means writes therein the information of the piece number and the index of a desired piece to be played selected out of the plurality of pieces.
  • the comparing means compares the piece number and index information of the track hit by the radiated beam at present, read by the read means and the desired piece number and index information of the selected desired piece written in advance in the writing means.
  • a control signal of a kind different is generated and applied to the moving means so that the moving direction of the radiated beam is changed reversely and the moving speed of the beam is successively decreased by steps. After a predetermined number of control signals are generated, generation of a control signal is stopped.
  • each of the plurality of tracks has its own address information and the signal processing means further comprises read means, write means, first comparing means, a first register, a second register and second comparing means.
  • the read means reads the address information of the track hit by the radiated beam at present, which is detected by the beam detecting means.
  • the write means writes the address information of the target track including the desired piece and index information of a desired piece to be played, selected out of a plurality of pieces.
  • the first comparing means compares the address information of the track hit by the radiated beam at present, read by the reading means and the address information of the target track written in advance in the write means and generates and applies to the moving means a control signal for changing reversely the moving direction of the radiated beam each time it is determined that the radiated beam passes the target track.
  • the address information of the track hit by the radiated beam is written in the first register when the address information of the track hit by the radiated beam is smaller than the address information of the target track.
  • the address information of the track hit by the radiated beam is written in the second register when it is determined as a result of the comparison by the first comparing means that the address information of the track hit by the radiated beam is larger than the address information of the target track.
  • the second comparing means compares the address information written in the first register and the address information written in the second register. When it is determined that the absolute value of a difference between the address information written in the first register and the address information written in the second register is smaller than a first set value and that the radiated beam has passed the target track, the second comparing means generates a control signal for decreasing the moving speed of the radiated beam from the first velocity to the second velocity.
  • the second comparing means When it is determined that the absoluted value of a difference therebetween is smaller than a second set value and that the radiated beam has passed the target track, it generates a control signal for decreasing the moving speed of the radiated beam from the second velocity to the third velocity.
  • the second comparing means generates control signals for successively decreasing the moving speed of the radiated beam and after the difference becomes smaller than the n-th set value, it generates a control signal for moving the radiated beam toward the track corresponding to the address information written in the first register or the second register.
  • a principal object of the present invention is to provide an information selection device of a disc player, capable of not only sensing the beginning of a desired piece of music but also directly searching an index existing within each piece.
  • a principal advantage of the present invention is that each time it is determined that the radiated beam has passed the track at the start of desired piece number and index information, the moving direction of the radiated beam is changed reversely and the moving speed thereof is decreased gradually by steps, which makes it possible to rapidly search a desired index of a desired piece number.
  • Fig. 1 is a schematic block diagram showing an information selection device of a disc player in accordance with an embodiment of the present invention.
  • the embodiment shown in Fig. 1 mainly comprises a pickup device 1, a signal processing device 12 and a moving device 16.
  • the pickup device 1 comprises a laser beam supplier 3 for generating laser beam 2.
  • the beam 2 generated by the laser beam supplier 3 is radiated on the surface of a disc 8 by means of a beam splitter 4, a mirror 5 and an objective lens 6.
  • the beam modulated and reflected on the surface of the disc 8 is guided by means of the objective lens 6 and the mirror 5 so as to be obtained as a modulated beam 9 by means of the beam splitter 4.
  • This modulated beam 9 is detected by a photodetector 10.
  • the whole structure of the pickup device 1 is placed on a pickup base (not shown) and a motor 11 moves the pickup device 1 radially on the disc 8.
  • the radiated beam 2 is moved to cross the tracks on the disc 8.
  • the objective lens 6 is moved horizontally on the disc 8 by the control of the electric current flowing in tracking coils 7 so that the radiated beam 2 is moved finely from one track to another track on the disc 8.
  • the signal processing circuit 12 at least comprises a read circuit 13 for reading and storing information from the modulated beam detected by the photodetector 10, a write circuit 14 for writing information inputted by key operation and the like, and a comparator 15 for comparing the information stored in the read circuit 13 and the information stored in the write circuit 14 to generate various control signals according to the result of the comparison.
  • the moving device 16 comprises a motor control circuit 17 and a tracking control circuit 18, which are controlled by various control signals from the comparator 15 of the signal processing circuit 12.
  • the motor control circuit 17 controls the motor 11 to move th 4 pickup base and the tracking control circuit 18 controls the electric current applied to the tracking coils 7 so that the radiated beam 2 is moved by tracking jump.
  • Fig. 2 is a flow chart for explaining an operation of the embodiment shown in Fig. 1. Now referring to Fig. 2, a searching operation will be specifically described.
  • the piece number of a desired piece to be played and a desired index within the piece (referred to hereinafter as the piece number and index data) are inputted by operation of keys and the like, the desired piece number and index data is written in the write circuit 14 of the signal processing circuit 12.
  • the first control signal generated first by the comparing means 15 of the signal processing circuit 12 is applied to the motor control circuit 17.
  • the motor 11 is rotated and the pickup base is moved so that the pickup device 1 is moved over the disc 8.
  • the disc 8 is also rotated by a disc motor (not shown).
  • the beam 2 radiated by the laser beam supplier 3 is reflected on the mirror 5 and converged through the objective lens 6 to hit a track of the disc 8 so that it is modulated and reflected by the information on the indexes etc. stored therein.
  • the reflected and modulated beam 9 is split by the beam splitter 4 and applied to the photodetector 10.
  • the photodetector 10 picks up an information signal of-an index etc. of the above stated track and applies it to the read circuit 13 of the signal processing circuit 12 so that it is read by the read circuit 13.
  • the read circuit 13 reads the piece number and index data Al of the track hit by the radiated beam 2 at present and the data Al is compared by the comparator 15 with the desired piece number and index data A2 written in the write circuit 14 (in the step 2). If the piece number and index data Al of the track hit at present is smaller than the desired piece number and index data A2, comparator 15 generates a control signal enabling the radiated beam 2 to move in the first direction toward outside because the radiated beam 2 hits the track located more inwardly than the track on which the music of the desired piece number and index data is to start (in the step 3).
  • the comparator 15 If the piece number and index data Al of the track hit by the beam at present is larger than or equal to the desired piece number and index data A2, the comparator 15 generates a control signal enabling the radiated beam 2 to move in the second direction toward inside because the radiated beam 2 hits the track located more outwardly than the track on which the music of the desired piece number and index data is to start (in the step 4). After the moving direction of the radiated beam 2 is determined by the comparator 15 as described above, the motor control circuit 17 rotates the motor 11 to move the pickup base so that the radiated beam 2 is moved at the first velocity.
  • the radiated beam 2 is moved in the first direction at the first velocity and during this movement, the piece number and index data of a track is read at predetermined intervals, for example, every 34 ms so that the comparator 15 of the signal processing circuit 12 compares the data (in the step 5).
  • the radiated beam 2 is moved continuously at the first velocity in the first direction since the radiated beam 2 does not pass the track at the start of the desired piece number and index data.
  • the comparator 15 determines that the thus read present piece number and index data Al of the track hit by the beam becomes larger than or equal to the desired piece number and index data A2 after the movement of the radiated beam 2 at the first velocity in the first direction, it is verified that the hitting point of the radiated beam 2 has passed the track at the start of the desired piece number and index data (in the step 5). Then, it is necessary to move the radiated beam 2 at the second velocity slower than the first velocity in the second direction opposite to the first direction.
  • the comparator 15 determines whether the moving speed of the radiated beam 2 at that time is the first velocity or not (in the step 6). If it is determined that the moving speed is the first velocity, the moving speed is set to the second velocity (in the step 7). Since the desired piece number and index data A2 compared by the comparator 15 in this case is not larger than the present piece number and index data Al (in the step 2), the moving direction of the radiated beam 2 is changed to the second direction (in the step 4).
  • the second control signal for selecting the above described conditions that is, the second velocity and the second direction is obtained from the comparator 15 and it is applied to the tracking coils 7 through the tracking control circuit 18.
  • the second control signal is a pulse signal having a width enabling the radiated beam to jump every ten tracks.
  • the radiated beam 2 in this-case is moved by every ten tracks in the second direction from an outer circumference toward an inner circumference of the disc so that the radiated beam 2 approaches the track at the start of the desired piece number and index data.
  • the read circuit 13 reads the present piece number and index data Al of a track hit by the radiated beam 2 at predetermined intervals (of ten tracks) and the comparator 15 compares the data Al and the desired piece number and index data A2. If it is determined as a result of the comparison by the comparator 15 that the desired piece number and index data A2 is not larger than the present piece number and index data A1, the radiated beam 2 exists on a circumference located more outwardly than the track at the start of the desired piece number and index data and does not pass this track yet. Accordingly, the radiated beam 2 is moved continuously in the second direction by every ten tracks toward the track at the start of the desired piece number and index data (in the step 8).
  • the signal processing circuit 12 controls the moving device 16 so that the moving direction of the radiated beam 2 is changed reversely and the moving speed thereof is decreased to the third velocity. This operation will be more specifically described in the following according to the flow chart in the same manner as described above.
  • the moving speed of the radiated beam 2 is the first velocity or not in the same manner as described above (in the step 6). If it is not the first velocity, it is determined whether it is the second velocity or not (in the step 9). If the moving speed of the radiated beam 2 at that time is the second velocity, the moving speed is set to the third speed (in the step 10) and the moving direction is changed again to the first direction (in the step 2).
  • the comparator 15 generates a third control signal of a pulse width enabling the radiated beam 2 to move in the initial first direction by one track and applies the third control signal to the tracking coils 7 through the tracking control circuit 18 to move the objective lens 6 so that the radiated beam 2 is moved. If the present piece number and index data Al has been read every ten tracks during the movement of the radiated beam 2 in the second direction at the second velocity, the radiated beam 2 in this case exists within ten tracks of the track at the start of the desired piece number and index data A2 except that the address of the track hit by the radiated beam immediately after it has passed the track at the start of the desired piece number and index data A2 cannot be read.
  • the present piece number and index data Al is read and the comparator 15 observes when the desired piece number and index data A2 becomes smaller than the present piece number and index data Al (in the step 5.).
  • the comparator 15 determines whether the moving speed of the radiated beam 2 at that time is the first velocity (in the step 6) or the second velocity (in the step 9). If it is determined that the moving speed is neither the first velocity nor the second velocity but the third velocity, the comparator 15 compares again the present piece number and index data Al and the desired piece number and index data A2 (in the step 11).
  • the moving direction of the radiated beam 2 is changed to the above described second direction (in the step 4) so that the radiated beam 2 is moved in the second direction at the third velocity until it passes the track at the start of the desired piece number and index data.
  • the comparator 15 stops generation of the third control signal to stop the searching (in the step 12).
  • the radiated beam 2 exists within one or two tracks from the track at the start of the desired piece number and index data A2 except for the case in which the read circuit 13 cannot read the present piece number and index data Al of the track hit by the radiate beam 2 immediately after it has passed the track at the start of the desired piece number and index data A2 . Accordingly, if the comparator 15 applies a normal tracking servosignal to the tracking coils 7 through the tracking control circuit 18 so that the tracking servocontrol is performed, the radiated beam 2 can immediately attain the track at the start of the desired piece number and index data.
  • Fig. 3 is a schematic block diagram showing an information selection device of the second embodiment of the present invention.
  • the embodiment_shown in Fig. 3 is the same as the embodiment shown in Fig. 1 except for the below described points.
  • a signal processing circuit 12' of the embodiment shown in Fig. 3 comprises a first comparator 15' for generating a control signal for determining the searching direction by comparison between the address (indicating a piece number and an index) of the track read at present, which is detected by the photodetector 10 and stored in the read circuit 13 and the address (indicating a piece number and an index) of the desired track selected by key operation or the like, which is stored in the write circuit 14.
  • the signal processing circuit 12' further comprises a first register 19 for writing the address read by the read circuit 13 when the first comparator 15' determines by the comparison that the address (the piece number and the index) read by the read circuit 13 is smaller than the address (the piece number and the index) written by the write circuit 14 and a second register 20 for writing the address read by the read circuit 13 when the first comparator 15' determines by the comparison that the address (the piece number and the index) written by the write circuit 14 is smaller than the address (the piece number and the index) read by the read circuit 13.
  • the signal processing circuit 12' further comprises a second comparator 21 for comparing the address written in the first register 19 and the address written in the second register 20 to generate various control signals for determining the searching speed according to the absolute value of the difference between the addresses (the difference in the A time of the addresses).
  • Fig. 4 is a flow chart for explaining an operation of the embodiment shown in Fig. 3
  • Fig. 5 is a diagram for explaining the state in which addresses are read in the embodiment shown in Fig. 3.
  • AMAX maximum address
  • AMIN minimum address
  • a piece selection button (not shown) is operated so that the address TT (indicating a piece number and an index) of the track of a selected piece is written in the write circuit 14.
  • the pickup device 1 is moved at the high first velocity toward the target track by rotation of the motor 11.
  • the beam 2 radiated by the laser beam supplier 3 is reflected on the mirror 5 and converged by the objective lens 6 to hit a track of the disc 8 so that it is modulated by the information stored therein and reflected.
  • the reflected modulated beam 2 is split by the beam splitter 4 and applied to the photodetector 10.
  • the photodetector 10 picks up an information signal indicating the address etc. of the track and applies it to the read circuit 13 of the signal processing circuit 12' so that it is read by the read circuit 13.
  • the read circuit 13 reads at predetermined time intervals (of 34 ms in this embodiment) the address AT (for example, a piece number and an index, or the time such as the A time accumulated from the first track of the program area to the track concerned) of a track A, B or C on the disc 8 as shown in Fig. 5 (in the step 3).
  • the address AT for example, a piece number and an index, or the time such as the A time accumulated from the first track of the program area to the track concerned
  • Each of the above described predetermined time intervals for reading needs to be a value smaller than a predetermined distance determined at the time of setting the searching speed. For example, if the difference between the A time of the target track and the A time of the present track hit by the radiated beam becomes smaller than 34 ms, it is necessary to make each interval for reading smaller than 34 ms at the time of changing the searching speed from the first velocity to the second velocity.
  • the address of the present track read as described above is first applied from the read circuit 13 to the first comparator 15', where only the piece number and index data in that address is picked up.
  • the address of the target track written in the write circuit 14 is also applied to the comparator 15', where only the piece number and index data in the address is picked up.
  • the piece number and index data thus picked up are compared by the first comparator 15' (in the step 4). If the radiated beam 2 hits the track A, the piece number and index data in the address of the track A thus read is smaller than the piece number and index data in the address of the target track and accordingly the pickup device 1 is continuously moved in the first direction so that the A time of the track thus read is written in the first register 19 (in the step 5).
  • the pickup device 1 moves, the A time data in the address of a track read at the above described predetermined intervals is successively written in the first register 19 until the hitting point of the radiated beam 2 passes the target track T (in Fig. 5).
  • the first comparator 15' When it is determined by the first comparator 15' that the address AT (the piece number and index data) of the track hit by the radiated beam 2 is larger than the address TT (the piece number and index data) of the target track and that the hitting point of the radiated beam 2 has passed the target track, the A time in the address of the track C (in Fig. 5) hit by the radiated beam 2 is written in the second register 20 (in the step 6).
  • the first comparator 15' When it is determined by the comparison by the comparator 15' as described above that the hitting point of the radiated beam 2 has passed the target track T, the first comparator 15' generates a control signal for changing reversely the moving direction of the pickup device 1 and applies it to the moving device 16.
  • the A time in the address of the track B read immediately before the hitting point of the radiated beam 2 passes the target track T is written in the first register 19 and the second comparator 21 calculates the difference between the A time in the address of the track B written in the first register 19 and the A time in the address of the track C written in the second register 20 immediately after the radiated beam 2 has passed the target track. Since each interval for reading corresponds to a value smaller than the distance determined at the time of setting the second velocity as described above, the absolute value of the above described difference in the A time is smaller than the value of the distance determined at the time of setting the second velocity.
  • the second comparator 21 generates, instead of the first control signal applied from a terminal 22 thereof to the motor control circuit 17, a second control signal for moving the radiated beam 2 in the opposite direction at a speed slower than that by the first control signal and applies it from a terminal 23 to the tracking control circuit 18.
  • the above described second control signal is supplied to the tracking coils 7 through the tracking control circuit 18.
  • the control signal is not applied to the motor control circuits 17 but is applied only to the tracking control circuit 18. Accordingly, the pickup base of the pickup device 1 is not moved and only the objective lens 6 is moved so that the radiated beam 2 crosses in the direction opposite to that in the case of the first control signal at the second velocity (17 ms) slower than the first velocity.
  • the radiated beam 2 is moved from the track C to the target track T by jumping every ten tracks.
  • the radiated beam 2 is moved (in the step 7) so that the read circuit 13 reads the address of one of the tracks D, F and G (as shown in Fig. 5) located at predetermined intervals each time the radiated beam 2 hits one of them and that the address set in the second register ' 20 approaches the address set in the first register 19.
  • the first comparator 15' compares the piece number and index data in the address of the present track thus read and the piece number and index data in the address of the target track T and determines whether the radiated beam 2 has passed the target track T.
  • the A time data in the address of each track thus read is written successively in the second register 20 until the radiated beam 2 passes the target track T.
  • the A time in the address of the track read immediately after the passing is written in the first register 19.
  • the second comparator 21 generates from a terminal 24 a third control singal for reversing again the moving direction of the radiated beam 2.
  • the second register 20 writes the A time in the address of the track F (in Fig. 5) read immediately before the radiated beam 2 passes the target track T and the first register 19 writes the A time in the address of the track G (in Fig.
  • the absolute value of the difference detected by the second comparator 21 by comparison between the A time in the address of the first register 19 and the A time in the address of the second register 20 becomes smaller than the value of the distance determined at the time of setting the third velocity and the above described third control signal becomes a signal of an amount for enabling the radiated beam 2 to move at the third velocity slower than the second velocity. Accordingly, when the third control singal is applied to the tracking coil 7 through the tracking control circuit 18, the objective lens 6 moves the radiated beam 2 toward the target track T in the same direction as the initially selected first direction by every three tracks of the disc 8.
  • the radiated beam 2 is moved (in the step 9) so that the A time in the address of each of the tracks Gl and G2 (in Fig. 5) located at predetermined intervals is successively read and written in the first register 19 and the A time in the address of the first register 19 approaches the A time in the address of the second register 20.
  • the difference detected by the second comparator 21 by comparison between the A time in the address of the first register 19 and the A time in the address of the second register 20 becomes smaller than a prescribed value within the searching range (in the step 8)
  • the radiated beam 2 is moved to the address written in the first register 19 (in the step 10) and after that, the movement of the radiated beam 2 is stopped (in the steps 11 and 12).
  • the radiated beam 2 attains the target track T in a waiting state for play (in the step 13).
  • the addresses of the respective tracks A, B and C are read at predetermined time intervals corresponding to the respective tracks while the radiated beam 2 is moved for searching.
  • addresses of some tracks can not be read due to dust or the like on the disc.
  • the read circuit 13 can not read the address of the track C hit by the radiated beam 2 immediately after the hitting point of the radiated beam 2 has passed the target track T, the radiated beam 2 continues to be moved in the same direction.
  • the first comparator 15' compares the read address and the address of the target track and when it is determined that the hitting point of the radiated beam 2 has passed the target track T, the moving direction of the radiated beam 2 is changed reversely.
  • the A time in the address of the track located more outwardly than the track C hit by the radiated beam 2 is set in the second register 20 and the A time in the address of the track B hit by the radiated beam 2 immediately before the hitting point thereof passes the target track T is set in the first register 19.
  • the radiated beam 2 moves in the opposite direction with the first velocity unchanged. Then, the A time data in the addresses of the tracks hit by the radiated beam 2 are set in the second register 20 until the hitting point of the radiated beam 2 exceeds the target track T.
  • the absolute value of the difference between the A time of the address set in the first register 19 and the A time of the address set in the second register 20 becomes smaller than the value of the distance determined at the time of setting the second velocity and subsequently the radiated beam 2 is moved at the velocity decreased to the second velocity.
  • the read circuit 13 can not read the address of the track B coming immediately before the hitting point of the radiated beam 2 passes the target track T and reads the address of the track C hit by the radiated beam 2 immediately after the hitting point thereof has passed the target track T, the first comparator 15' determines that the hitting point of the radiated beam 2 has passed the target track T and the moving direction of the radiated beam 2 is reversed as described above.
  • the address read on the subsequent occasion is the address of the track B' which slightly deviates from the track B to be attained by the radiated beam 2 after it has passed the target track T.
  • the first comparator 15' compares the piece number and index data in the address of the present track read by the read circuit 13 and the piece number and index data in the address of the target track written in the write circuit 14. The same effect can also be obtained if comparison is made between the A time data in the respective addresses.
  • the A time data in the respective addresses are stored in the first register 19 and the second register 20 and the searching speed is determined based on the difference between these A time data.
  • the searching speed may be determined by detection of a difference in the frame numbers included in the respective addresses, which are counted from the first track of the program area and stored in the first register 19 and the second register 20.
  • other information may also be used to determine the searching speed as far as it represents the distance between the track hit by the beam at present and the target track.

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Moving Of Head For Track Selection And Changing (AREA)
EP86102999A 1985-03-08 1986-03-06 Verfahren zum Auswählen von Informationen eines Plattenspielers Expired EP0193961B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP46804/85 1985-03-08
JP4680485A JPS61206932A (ja) 1985-03-08 1985-03-08 情報再生装置
JP50866/85 1985-03-14
JP5086685A JPS61210526A (ja) 1985-03-14 1985-03-14 デイスクプレ−ヤの情報選択装置

Publications (3)

Publication Number Publication Date
EP0193961A2 true EP0193961A2 (de) 1986-09-10
EP0193961A3 EP0193961A3 (en) 1988-01-07
EP0193961B1 EP0193961B1 (de) 1990-07-04

Family

ID=26386929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102999A Expired EP0193961B1 (de) 1985-03-08 1986-03-06 Verfahren zum Auswählen von Informationen eines Plattenspielers

Country Status (3)

Country Link
US (1) US4716557A (de)
EP (1) EP0193961B1 (de)
DE (1) DE3672358D1 (de)

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EP0353897A3 (de) * 1988-08-01 1991-02-06 Seagate Technology International Kontrollsystem für einen Plattenantriebskopf
EP0407573A4 (en) * 1987-02-27 1991-03-20 Sony Corporation Disc recording apparatus
US8971216B2 (en) 1998-09-11 2015-03-03 Alcatel Lucent Method for routing transactions between internal and external partners in a communication center
US9002920B2 (en) 1998-09-11 2015-04-07 Genesys Telecommunications Laboratories, Inc. Method and apparatus for extended management of state and interaction of a remote knowledge worker from a contact center
US9008075B2 (en) 2005-12-22 2015-04-14 Genesys Telecommunications Laboratories, Inc. System and methods for improving interaction routing performance
USRE45583E1 (en) 1999-12-01 2015-06-23 Genesys Telecommunications Laboratories, Inc. Method and apparatus for providing enhanced communication capability for mobile devices on a virtual private network
USRE45606E1 (en) 1997-02-10 2015-07-07 Genesys Telecommunications Laboratories, Inc. Call and data correspondence in a call-in center employing virtual restructuring for computer telephony integrated functionality
USRE46060E1 (en) 1997-02-10 2016-07-05 Genesys Telecommunications Laboratories, Inc. In-band signaling for routing
USRE46153E1 (en) 1998-09-11 2016-09-20 Genesys Telecommunications Laboratories, Inc. Method and apparatus enabling voice-based management of state and interaction of a remote knowledge worker in a contact center environment
US9516171B2 (en) 1997-02-10 2016-12-06 Genesys Telecommunications Laboratories, Inc. Personal desktop router
US9553755B2 (en) 1998-02-17 2017-01-24 Genesys Telecommunications Laboratories, Inc. Method for implementing and executing communication center routing strategies represented in extensible markup language
USRE46438E1 (en) 1999-09-24 2017-06-13 Genesys Telecommunications Laboratories, Inc. Method and apparatus for data-linking a mobile knowledge worker to home communication-center infrastructure
USRE46528E1 (en) 1997-11-14 2017-08-29 Genesys Telecommunications Laboratories, Inc. Implementation of call-center outbound dialing capability at a telephony network level

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DE3702693A1 (de) * 1987-01-30 1988-08-11 Thomson Brandt Gmbh Cd-spieler
US5202864A (en) * 1988-04-14 1993-04-13 Matsushita Electric Industrial Co., Ltd. Slip-off preventing tracking control apparatus
JP2658561B2 (ja) * 1990-11-15 1997-09-30 日本電気株式会社 横断トラック数カウント回路
JPH08279164A (ja) * 1995-04-04 1996-10-22 Sharp Corp 情報記憶媒体駆動装置
US6163510A (en) 1998-06-30 2000-12-19 International Business Machines Corporation Multimedia search and indexing system and method of operation using audio cues with signal thresholds
US8260121B2 (en) * 2006-05-02 2012-09-04 Cyberlink Corp. Systems and methods for writing data to an optical disc

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JPS5913101B2 (ja) * 1977-12-16 1984-03-27 株式会社日立製作所 ランダムアクセス方法
US4506355A (en) * 1981-08-24 1985-03-19 Discovision Associates Method and apparatus for information retrieval from an optically readable storage medium
EP0007199B1 (de) * 1978-06-30 1986-12-30 Discovision Associates Verfahren und Vorrichtung zur Informationswiedergabe von einem optisch lesbaren Speichermedium
JPS5611673A (en) * 1979-07-03 1981-02-05 Pioneer Video Corp Address information retrieval method in information recording medium reproducing unit
JPS5753879A (en) * 1980-09-12 1982-03-31 Victor Co Of Japan Ltd High-speed searching system for reproducer of disk-shaped information recording medium
JPS57198586A (en) * 1981-05-28 1982-12-06 Sony Corp Digital disc reproducing device
JPS5850675A (ja) * 1981-09-18 1983-03-25 Victor Co Of Japan Ltd 円盤状情報記録媒体の情報記録信号トラツク検索方式
EP0302138A1 (de) * 1981-10-28 1989-02-08 Discovision Associates Verfahren zum Lokalisieren einer als Ziel ausgewählten, Information enthaltenden Spur auf einer Aufzeichnungsscheibe
US4536863A (en) * 1982-04-15 1985-08-20 Discovision Associates Method and apparatus for recovering information from a videodisc
EP0114508B1 (de) * 1982-12-27 1987-11-25 Kabushiki Kaisha Toshiba Wiedergabegerät für eine Aufnahmeplatte

Cited By (21)

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EP0407573A4 (en) * 1987-02-27 1991-03-20 Sony Corporation Disc recording apparatus
EP0353897A3 (de) * 1988-08-01 1991-02-06 Seagate Technology International Kontrollsystem für einen Plattenantriebskopf
US9516171B2 (en) 1997-02-10 2016-12-06 Genesys Telecommunications Laboratories, Inc. Personal desktop router
USRE45606E1 (en) 1997-02-10 2015-07-07 Genesys Telecommunications Laboratories, Inc. Call and data correspondence in a call-in center employing virtual restructuring for computer telephony integrated functionality
USRE46243E1 (en) 1997-02-10 2016-12-20 Genesys Telecommunications Laboratories, Inc. In-band signaling for routing
USRE46060E1 (en) 1997-02-10 2016-07-05 Genesys Telecommunications Laboratories, Inc. In-band signaling for routing
USRE46521E1 (en) 1997-09-30 2017-08-22 Genesys Telecommunications Laboratories, Inc. Method and apparatus for extended management of state and interaction of a remote knowledge worker from a contact center
USRE46528E1 (en) 1997-11-14 2017-08-29 Genesys Telecommunications Laboratories, Inc. Implementation of call-center outbound dialing capability at a telephony network level
US9553755B2 (en) 1998-02-17 2017-01-24 Genesys Telecommunications Laboratories, Inc. Method for implementing and executing communication center routing strategies represented in extensible markup language
US9002920B2 (en) 1998-09-11 2015-04-07 Genesys Telecommunications Laboratories, Inc. Method and apparatus for extended management of state and interaction of a remote knowledge worker from a contact center
USRE46153E1 (en) 1998-09-11 2016-09-20 Genesys Telecommunications Laboratories, Inc. Method and apparatus enabling voice-based management of state and interaction of a remote knowledge worker in a contact center environment
US9350808B2 (en) 1998-09-11 2016-05-24 Alcatel Lucent Method for routing transactions between internal and external partners in a communication center
US10218848B2 (en) 1998-09-11 2019-02-26 Genesys Telecommunications Laboratories, Inc. Method and apparatus for extended management of state and interaction of a remote knowledge worker from a contact center
USRE46387E1 (en) 1998-09-11 2017-05-02 Genesys Telecommunications Laboratories, Inc. Method and apparatus for extended management of state and interaction of a remote knowledge worker from a contact center
US8971216B2 (en) 1998-09-11 2015-03-03 Alcatel Lucent Method for routing transactions between internal and external partners in a communication center
USRE46457E1 (en) 1999-09-24 2017-06-27 Genesys Telecommunications Laboratories, Inc. Method and apparatus for data-linking a mobile knowledge worker to home communication-center infrastructure
USRE46438E1 (en) 1999-09-24 2017-06-13 Genesys Telecommunications Laboratories, Inc. Method and apparatus for data-linking a mobile knowledge worker to home communication-center infrastructure
USRE45583E1 (en) 1999-12-01 2015-06-23 Genesys Telecommunications Laboratories, Inc. Method and apparatus for providing enhanced communication capability for mobile devices on a virtual private network
USRE46538E1 (en) 2002-10-10 2017-09-05 Genesys Telecommunications Laboratories, Inc. Method and apparatus for extended management of state and interaction of a remote knowledge worker from a contact center
US9854006B2 (en) 2005-12-22 2017-12-26 Genesys Telecommunications Laboratories, Inc. System and methods for improving interaction routing performance
US9008075B2 (en) 2005-12-22 2015-04-14 Genesys Telecommunications Laboratories, Inc. System and methods for improving interaction routing performance

Also Published As

Publication number Publication date
US4716557A (en) 1987-12-29
EP0193961A3 (en) 1988-01-07
DE3672358D1 (de) 1990-08-09
EP0193961B1 (de) 1990-07-04

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